<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			#sel{
				width: 100px;
				height: 35px;
				border: 1px solid #000000;
				border-radius: 10px;
				line-height: 35px;
				margin: 0;
				padding: 0;
			}
			#sel .showCon{
				width: 100%;
				height: 100%;
				overflow: hidden;
				text-align: center;
				margin: 0;
				padding: 0;
				cursor: pointer;
			}
			#sel .content{
				display: none;
				list-style: none;
				width: 100%;
				text-align: center;
				border: 1px solid #000;
				border-radius: 10px;
				margin: 0;
				padding: 0;
				margin-top: 5px;
			}
			#sel .content li{
				height: 30px;
				line-height: 30px;
				margin: 0;
				padding: 0;
				cursor: pointer;
				border-bottom: 1px solid #ddd;
			}
			#sel .content li:last-of-type{
				border: none;
			}
			#sel .showCon:hover ~ .content{
				display: block;
			}
		</style>
	</head>
	<body>
		<select name="city">
			<optgroup label="广东">			
				<option value="广州">广州</option>
				<option value="深圳">深圳</option>
			</optgroup>
			<optgroup label="广西">			
				<option value="桂林">桂林</option>
				<option value="南宁">南宁</option>
			</optgroup>
		</select>
		<!--<div id="sel">
			<div class="showCon">
				<span data-val="北京">北京</span>
			</div>
			<ul class="content">
				<li data-val = "北京">北京</li>
				<li data-val = "上海">上海</li>
				<li data-val = "广州">广州</li>
				<li data-val = "深圳">深圳</li>
			</ul>
		</div>-->
		<script type="text/javascript">
			
		</script>
	</body>
</html>
